The Nokia HDW-3 Wireless Headset can be connected to a compatible phone that supports Bluetooth technology. This gives you complete freedom to make and receive calls while on the move or at the office. The Bluetooth technology makes it possible to connect compatibile communication devices without using cables. A bluetooth connection does not require that the phone and the headset be in line of sight, but both devices shoul be within 32 feet (10 metres) of each other.